Unable to gain XP as Squad Leader

I haven't tested this with the other classes, but my friend is continuing to gain XP and levels as the Commander role, while I have gained thousands of points as Squad Leader with nothing saving. I wouldn't be bothered normally, but since I need the first level to get a sidearm (which is pretty vital since I use the G 41 and reload it sparingly), it's something of a problem for survivability in matches.